Inland Revenue vs UK

Inland Revenue and UK both are nouns.

Word	Noun	Adjective	Verb	Adverb
Inland Revenue	Yes	No	No	No
UK	Yes	No	No	No

Inland Revenue (noun)	UK (noun)
a board of the British government that administers and collects major direct taxes	a monarchy in northwestern Europe occupying most of the British Isles; divided into England and Scotland and Wales and Northern Ireland; `Great Britain' is often used loosely to refer to the United Kingdom